1. POST ( Physics of Stratocumulus Top) Hermann Gerber, P.I. GCSS/CFMIP Meeting, 7-12 June, 2009 UBC, Vancouver, Canada Introduction

2. University of Warsaw Szymon Malinowski, Wojciech Kumula, Krysztof Haman Gerber Scientific Hermann Gerber University of Utah Steven Krueger, Samantha Hill University of Washington Rob Wood Colorado State University Takanobu Yamaguchi University of California, UCSC Patrick Chuang, Dione Lee Rossiter University of California, UCI Djamal Kheli, Carl Friehe Desert Research Institute Jim Hudson NPGS Qing Wang NCAR Stuart Beaton, Wojciech Grabowski CIRPAS Haflidi Jonsson, Roy Woods, Jesus Galvan NRL Arunas Kuciauskas, Shouping Wang, Anthony Bucholtz PARTICIPANTS SPONSORS National Science Foundation Office of Naval Research

3. (Stevens et al., B.A.M.S., 2003, 38) Monterey POST DYCOMS II

4. ENTRAINMENT VELOCITY vs BUOYANCY JUMP

5. POST DYCOMS II 1000-hz PVM and UFT Data

6. Issues Approach High-resolution Lagrangian aircraft measurements in unbroken Sc What are the properties and role of the EIL (Entrainment Interface Layer)? Is isothermal entrainment of conditioned EIL air the rule? Are details of processes at Sc top necessary for accurate w e estimates, or do knowledge of surface fluxes, interface jumps, and radiation suffice? How important is CTEI? Does Sc modeling from microphysical- to meso-scales compare favorably with POST observations? Can existing parameterizations of w e be improved?

7. CIRPAS TWIN OTTER

8. 45.7 cm 55.9 cm ~60 cm 14 cm 38.1 cm 8.9 cm 21.6 cm PVM UFT L-alpha UCI L-alpha NCAR L-alpha Lycor, UCI INSTRUMENTATION on T.O. NOSE Gust Probe (40 hz) (1000 hz) (100 hz)

9. http://www.eol.ucar.edu/projects/post/

10. POST FLIGHTS: July 16 – Aug. 15, 2008 17 flights (~5 hr. each) 8 night-time flights 9 day-time flights 15 Lagrangian flights

13. 20 km Twin Otter Vertical Flight Track Sc Top Sc base FLIGHT TO10

14. POST Web Page: http://www.eol.ucar.edu/projects/post Suggested POST Web Page Browsing: POST Field Catalog, Science Team Meeting (5-6 Feb, 2009), Initial Analysis by Qing Wang at Meeting